C++ 数组模拟链表：高效插入和查询操作

The given code is a C++ program that uses an array to simulate a linked list. It takes input for the length of the original sequence and the number of operations to perform. It then reads the original sequence and stores it in an array. It uses the array to perform two types of operations:
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Insertion: It takes input for the position (k) and the value (val) to be inserted. It creates a new node in the array and updates the pointers to insert the new node between the kth and (k+1)th nodes.
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Query: It takes input for the position (k) and prints the value of the kth node in the array.

The program performs the given number of operations and prints the results of the query operations.

The program assumes that the input is valid and within the given constraints.

To solve the problem, the program uses an array of ListNode structures to represent the linked list. Each structure has two fields: value (to store the value of the node) and next (to store the index of the next node in the array).

The program starts by reading the length of the original sequence and the number of operations. It then creates an array of ListNode structures with size (n+1), where n is the length of the original sequence. Each element of the array represents a node in the linked list.

Next, it reads the values of the original sequence and stores them in the value field of the corresponding nodes in the array. It also initializes the next field of each node to point to the next node in the array.

After initializing the array, the program sets the next field of the last node in the array to 0, indicating the end of the linked list. It also sets the head variable to 1, indicating the first node in the linked list.

The program then enters a loop to perform the operations. In each iteration of the loop, it reads the operation type (op) and performs the corresponding operation.

For the insertion operation (op=1), the program reads the position (k) and the value (val) to be inserted. It creates a new node by finding the index of the first free node in the array (stored in nodes[0].next), updates the next field of the first free node to point to the next node in the array (nodes[newNodeIndex].next), updates the value field of the first free node with the inserted value (nodes[newNodeIndex].value), and updates the next field of the previous node (kth node) to point to the inserted node (nodes[k].next).

For the query operation (op=2), the program reads the position (k) and prints the value of the kth node in the array (nodes[cur].value), where cur is the index of the kth node in the array. The program uses a loop to traverse the linked list from the head node to the kth node.

Finally, the program returns 0 to indicate successful execution.

However, the given code is incomplete and contains some errors. It does not handle the case where the number of operations exceeds the size of the array (q > 100). It also does not handle the case where the position (k) for the query operation is greater than the length of the original sequence (k > n). These errors need to be fixed for the code to work correctly.